How many gram atoms are present in 4000 amu of calcium ? 

Explanation

To solve the problem of how many gram atoms are present in 4000 amu of calcium, we can follow these steps:

### Step 1: Understand the concept of amu and gram atoms
- Atomic mass unit (amu) is a unit used to express atomic and molecular weights.
- One gram atom or mole of a substance corresponds to its molecular mass in grams.

### Step 2: Convert amu to grams
- We know that 1 amu is equivalent to \(1.66 \times 10^{-24}\) grams.
...